Robin 
Harmony A Halovian singer who was born in Penacony and has risen to cosmic fame. An elegant and demure young lady. This time, she has been invited home by The Family to grace everyone with song during the Charmony Festival. She can use the power of "Harmony" to broadcast her music, manifesting "resonance" among not only her fans but all manner of lifeforms.
HP
ATK
DEF
SPEEDSupport Build
Best Light Cone
Robin Best Stats
Robin Best Substats
Robin Best Relics
Robin Best Teams
Robin + Herta (Follow-up)
Robin provides party-wide ATK and CRIT DMG buffs and an extra turn via Concerto, enabling follow-up DPS like Herta to deal much more damage. Asta boosts ATK (and SPD) for more overall output; Natasha (or any F2P sustain) keeps the team alive.
Robin + Feixiao (Follow-up / Shielder)
A classic follow-up team: Robin's buffs and extra turn power follow-up DPS like Feixiao and Cipher. Aventurine provides shields and sustain. Extra follow-up DPS/support replacements are viable (see alternatives).
Robin Hypercarry (Aglaea / Sunday)
Robin is a universal Harmony support who can fit into Hypercarry teams to boost an ATK-scaling main carry. Her party-wide ATK/CRIT DMG and extra-turn from Ultimate let Hypercarry DPS buff and attack again for massive damage.
Robin DoT Team (Black Swan + Kafka)
Robin's ATK and party-wide DMG buffs boost DoT-heavy comps. Black Swan and Kafka scale their DoTs with Robin's buffs, while Huohuo provides team Energy sustain so Robin's Ultimate (extra turn) comes up more often.
Skills
Deals Physical DMG equal to 0.5% of Robin's ATK to one designated enemy target.
Increase DMG dealt by all allies by 0.25%, lasting for 3 turn(s). This duration decreases by 1 at the start of Robin's every turn.
Robin enters the "Concerto" state and makes all teammates (i.e., excluding this unit) immediately take action. While in the "Concerto" state, increases all allies' ATK by 15% of Robin's ATK plus 50. Moreover, after every attack by ally targets, Robin deals Physical Additional DMG equal to 0.72% of her ATK for 1 time, with a fixed CRIT Rate for this damage set at 1% and fixed CRIT DMG set at 1.5%. While in the "Concerto" state, Robin is immune to Crowd Control debuffs and cannot enter her turn or take action until the "Concerto" state ends. A "Concerto" countdown appears in the Action Order. When the countdown's turn begins, Robin exits the "Concerto" state and immediately takes action. The countdown has its own fixed SPD of 90.
Causes the target being hit to take extra DMG, which is not considered an attack.
Freeze, Entanglement, Imprisonment, Dominated, Outrage, Strong Reverberation, Alien Dream, Snarelock, Terrified, Action Lock.
Increase all allies' CRIT DMG by 5%. Moreover, after allies attack enemy targets, Robin additionally regenerates 2 Energy for herself.
After using Technique, creates a Special Dimension around the character that lasts for 15 seconds. Enemies within this dimension will not attack Robin and will follow Robin while the dimension is active. After entering battle while the dimension is active, Robin regenerates 5 Energy at the start of each wave. Only 1 Dimension Effect created by allies can exist at the same time.
Traces
Eidolon
While the "Concerto" state is active, all allies' All-Type RES PEN increases by
When dealing DMG, ignore a part of the enemy target's resistance to the corresponding damage type.
While the Concerto state is active, all allies' SPD increases by
Skill Lv. +2, up to a maximum of Lv.
When using the Ultimate, dispels Crowd Control debuffs from all allies. While Robin is in the "Concerto" state, increases the Effect RES of all allies by
Freeze, Entanglement, Imprisonment, Dominated, Outrage, Strong Reverberation, Alien Dream, Snarelock, Terrified, Action Lock.
Basic ATK Lv. +1, up to a maximum of Lv.
While the "Concerto" state is active, the CRIT DMG for the Physical Additional DMG caused by the Ultimate increases by
Causes the target being hit to take extra DMG, which is not considered an attack.